METHOD FOR PERMITTING REPRODUCTION OF CONTENT FILE AND RECORDED MEDIUM ON WHICH REPRODUCTION SOFTWARE FOR REPRODUCING CONTENT FILE IS RECORDED

摘要

Conventionally, a free content file is copied from one user terminal to another unlimitedly when the content file is acquired and reproduced by a reproduction software application and the user enjoys it. However this is not good in respect of the copyright. According to the invention, when a reproduction software application for reproducing a content file is set up, a client ID unique to the reproduction software application is added to the reproduction software application. A client ID is added to the content file when the content file is downloaded in a terminal computer. Only when both client Ids agree with each other, the reproduction of the content file is permitted.